KR102596266B1 - Partial discharge detecting system - Google Patents

Abstract

A partial discharge detection system according to an embodiment of the present invention includes a partial discharge detection device for generating a reference frequency signal, detecting a partial discharge pulse signal, and converting the detected partial discharge pulse signal into a partial discharge digital signal, and the reference frequency signal. A main processor for synchronizing the partial discharge digital signal, extracting valid data from the synchronized partial discharge digital signal, and storing the extracted valid data, and the partial discharge detection device and the main processor based on the zero phase point of It may include an energy harvesting power supply that supplies power.

Description

Partial discharge detection system {PARTIAL DISCHARGE DETECTING SYSTEM}

The present invention relates to a partial emission detection system capable of detecting partial discharge.

When power equipment ages or high voltage stress accumulates in power equipment, various phenomena such as partial discharge occur in wires or power equipment.

This phenomenon is a preliminary cause of power equipment failure, and if not properly replaced or repaired, it can also cause power equipment failures such as flashover.

Partial discharge occurs in various forms depending on the wire, facility, or environment in which it occurs, and it is difficult to measure it accurately.

Many attempts are being made to detect partial discharge in advance and preserve power facilities, but in reality, it is difficult. Currently, many companies are providing equipment that can detect partial discharge using sensors, but this has the problem of being expensive and requiring a person to manually measure it on a regular basis.

In addition, the partial discharge signal is sensed in the form of high frequency through a broadband response sensor, and existing high-speed ADC and FPGA/DSP/Ext. A common method is to perform high-speed signal processing by applying systems such as memory.

In addition, the 60Hz electrical signal, which is the standard for phase analysis, is input through a separate ADC and applied to the analysis. The sensing signal has a frequency of approximately tens to hundreds of MHz, and the measuring device processes the signal through signal sampling of approximately 10 to 100MHz. do.

However, although this method is capable of high-speed signal processing, the circuit configuration is complex and expensive, and the amount of data to be processed is large, making it difficult to process at the communication rate of LPWAN proposed by IoT.
Prior literature related to this includes US Patent Application Publication No. US2015/0260777.

The purpose of the present invention is to provide a partial discharge detection system that can process sensing data without using an external memory by using an ADC of several MHz and changing the data processing method from continuous to intermittent.

The purpose of the present invention is to provide an invention that can manage partial discharge by incorporating IoT (Internet of Thing) technology, attaching a sensor system to each location, and using a sensor network.

Additionally, the purpose of the present invention is to simplify the circuit for measuring partial discharge and optimize the partial discharge analysis algorithm.

A partial discharge detection system according to an embodiment of the present invention includes a partial discharge detection device for generating a reference frequency signal, detecting a partial discharge pulse signal, and converting the detected partial discharge pulse signal into a partial discharge digital signal, and the reference frequency signal. A main processor for synchronizing the partial discharge digital signal, extracting valid data from the synchronized partial discharge digital signal, and storing the extracted valid data, and the partial discharge detection device and the main processor based on the zero phase point of It may include an energy harvesting power supply that supplies power.

According to various embodiments of the present invention, since only valid data about partial discharge is stored, sensing data can be processed without external memory and at a low price.

1 is a block diagram for explaining the configuration of a partial discharge detection system according to an embodiment of the present invention.
Figure 2 is a flowchart for explaining a partial discharge detection method of a partial discharge device according to an embodiment of the present invention.
Figure 3 is a diagram explaining a reference frequency signal and a PD pulse digital signal according to an embodiment of the present invention.
FIG. 4 is a diagram illustrating an example of detecting a zero phase point from a reference frequency signal according to an embodiment of the present invention.
Figure 5 is a diagram illustrating a process of synchronizing a reference frequency signal and a PD pulse digital signal according to an embodiment of the present invention.
FIG. 6 is a diagram illustrating a process of buffering a unit PD digital signal of one period from a PD pulse digital signal according to an embodiment of the present invention.
FIG. 7 is a diagram illustrating the reference voltage that serves as a reference for detecting the PD peak point according to an embodiment of the present invention, and FIG. 8 is a diagram illustrating the PD peak point using the reference voltage according to an embodiment of the present invention. This is a diagram explaining the detection process.
Figure 9 is a diagram comprehensively explaining the process of extracting valid data according to an embodiment of the present invention.
FIG. 10 is a diagram illustrating the structure of effective data containing information on effective PD points indicating the occurrence of partial discharge according to an embodiment of the present invention.
Figure 11 is a diagram explaining a combination of valid data packets according to an embodiment of the present invention.
Figure 12 is a diagram explaining the configuration of a partial discharge detection sensor according to an embodiment of the present invention.
FIG. 13A is a circuit diagram showing the configuration of a general magnetic sensor, and FIG. 13B is a circuit diagram showing the configuration of a magnetic sensor according to an embodiment of the present invention.
Figure 14 is a diagram comparing the output of the signal observed at Vp-Vn when a reference frequency signal of 60Hz is applied to each of the existing magnetic sensor and the magnetic sensor according to an embodiment of the present invention.
Figure 15 is a diagram comparing the output of differential signals (Vp-Vn) according to the frequency of a high-frequency signal applied to a conventional magnetic sensor and a magnetic sensor according to an embodiment of the present invention.
Figures 16a and 16b are diagrams showing output results of a high-frequency partial discharge signal and a 60Hz reference frequency signal when using an existing magnetic sensor.
Figures 17a and 17b are diagrams showing output results of a high-frequency partial discharge signal and a 60Hz reference frequency signal when using a magnetic sensor according to an embodiment of the present invention.
Figure 18a is a diagram comparing waveforms obtained when using a high frequency current transformer (HFCT) sensor, which is generally applied to void partial discharge waveforms, and when using a magnetic sensor according to an embodiment of the present invention.
Figure 18b is a diagram comparing waveforms obtained when using a high-frequency current transformer sensor generally applied to detect corona partial discharge waveforms and when using a magnetic sensor according to an embodiment of the present invention.

Hereinafter, embodiments related to the present invention will be described in more detail with reference to the drawings. The suffixes “module” and “part” for components used in the following description are given or used interchangeably only for the ease of preparing the specification, and do not have distinct meanings or roles in themselves.

1 is a block diagram for explaining the configuration of a partial discharge detection system according to an embodiment of the present invention.

The partial discharge detection system 100 according to the following embodiment may be installed in a power distribution facility.

Referring to FIG. 1, the partial discharge detection system 100 according to an embodiment of the present invention includes an energy harvesting power supply unit 110, a power management device 120, a partial discharge detection device 130, and a wireless communication device ( 140) and a main processor 150.

The energy harvesting power supply device 110 may supply power required for the internal operation of the partial discharge detection system 100.

The energy harvesting power supply device 110 may include a solar cell 111, a power conversion unit 113, and a secondary battery 115.

The solar cell 111 may include a solar cell array and may absorb solar energy.

The power conversion unit 113 may convert solar energy absorbed by the solar cell 111 into electrical energy.

The secondary battery 115 can store the converted electrical energy.

The power management device 120 may manage the power state of the partial discharge detection system 100.

The power management device 120 may include a power monitoring unit 121 and a power controller 123.

The power monitoring unit 121 may monitor the remaining charge value of the secondary battery 115.

The main processor 150 may periodically transmit the remaining charge value of the secondary battery 115 monitored by the power monitoring unit 121 to the management server through the wireless communication device 140.

The power controller 123 may periodically activate or deactivate the operations of the partial discharge detection device 130 and the wireless communication device 140 under the control of the main processor 150.

Since the partial discharge detection system 100 according to an embodiment of the present invention applies an energy harvesting method, low-power operation is required, and power consumption can be reduced through sleep / wake-up mode.

The partial discharge detection device 130 may detect a partial discharge signal and transmit the detected partial discharge signal to the main processor 150.

The partial discharge detection device 130 may include a partial discharge detection sensor 131, a reference signal receiver 133, and an analog signal processor 135.

The partial discharge detection sensor 131 may generate a partial discharge (PD) pulse signal and transmit the generated PD pulse signal to the analog signal processor 135.

The reference signal receiver 133 may generate a reference frequency signal for synchronization with the PD pulse signal and transmit the generated reference frequency signal to the analog signal processor 135.

The analog signal processor 135 may convert the PD pulse signal into a PD pulse digital signal.

The wireless communication device 140 may wirelessly communicate with an external management server or partial discharge analysis system.

The wireless communication device 140 may transmit power status information of the secondary battery 115 to an external management server through a low power wide area network standard.

Additionally, the wireless communication device 140 may transmit a valid data packet containing information about partial discharge to a partial discharge analysis system or an external management server through a low power wide area network standard.

The main processor 150 may control the overall operation of the partial discharge device 100.

The main processor 150 may activate a partial discharge (PD) detection sensor (hereinafter referred to as PD detection sensor 131) and input a reference frequency signal to the analog signal processor 135.

The main processor 150 may detect zero phase points of the reference frequency signal.

The main processor 150 may synchronize the reference frequency signal with the PD pulse digital signal based on the detected zero phase points.

The main processor 150 may buffer the PD digital signal in units of one cycle of the synchronized PD pulse digital signal.

The main processor 150 may obtain a reference voltage for detecting valid data, taking noise into account, from the buffered unit PD digital signal of one cycle.

The main processor 150 may extract a PD peak point from a plurality of PD points included in a unit PD digital signal using the obtained reference voltage.

The main processor 150 may extract valid data containing information about the detected PD peak points.

The main processor 150 may determine whether the PD pulse signal period of the standard number required for the PRPD analysis technique has been secured.

When the standard number of PD pulse signal cycles required for the PRPD technique is secured, the main processor 150 may transmit a valid data packet, which is a combination of valid data, to an external management server or partial discharge analysis system.

Figure 2 is a flowchart for explaining a partial discharge detection method of a partial discharge device according to an embodiment of the present invention.

Referring to FIG. 2, the main processor 150 activates a partial discharge (PD) detection sensor (hereinafter referred to as PD detection sensor 131) and inputs a reference frequency signal to the analog signal processor 135 (S201) ).

In one embodiment, as the PD detection sensor 131 is activated, the PD detection sensor 131 may generate a PD pulse signal and transmit the generated PD pulse signal to the analog signal processor 135.

Additionally, the reference signal generator 133 may generate a reference frequency signal and transmit the generated reference frequency signal to the analog signal processor 135.

In another embodiment, the reference signal generator 133 may receive a reference frequency signal from the outside and transmit the received reference frequency signal to the analog signal processor 135.

In one embodiment, the reference frequency signal may be a frequency signal with a frequency of 60 Hz, but this is only an example.

The reference frequency signal may be a frequency signal that serves as a reference for phase information.

The analog signal processing unit 135 of the partial discharge detection unit 130 separates the reference frequency signal and the partial discharge pulse signal (PD pulse signal) and converts the separated PD pulse signal into a PD pulse digital signal (S203).

This will be explained with reference to FIG. 3 .

Figure 3 is a diagram explaining a reference frequency signal and a PD pulse digital signal according to an embodiment of the present invention.

Referring to FIG. 3, a PD pulse digital signal 330 obtained by ADC (analog-to-digital conversion) processing of a reference frequency signal 310 of 60 Hz and a PD pulse signal is shown.

Figure 2 will be described again.

The main processor 150 detects zero phase points of the reference frequency signal (S205).

The zero phase point will be described with reference to FIG. 4.

FIG. 4 is a diagram illustrating an example of detecting a zero phase point from a reference frequency signal according to an embodiment of the present invention.

Referring to FIG. 4 , the main processor 150 may detect a zero phase point 311 whose phase is 0 from the reference frequency signal 310.

Main processor 150 may detect one or more zero phase points from reference frequency signal 310. The zero phase point can later be used to synchronize the PD pulse digital signal and the reference frequency signal.

Figure 2 will be described again.

The main processor 150 synchronizes the reference frequency signal with the PD pulse digital signal based on the detected zero phase points (S207).

In one embodiment, the main processor 150 may synchronize the reference frequency signal with the PD pulse digital signal based on the zero phase points to detect the partial discharge signal using the Phase Resolved Partial Discharge (PRPD) technique. there is.

The PRPD technique may be a technique for analyzing patterns in which partial discharge signals are periodically generated in the same phase.

Figure 5 is a diagram illustrating a process of synchronizing a reference frequency signal and a PD pulse digital signal according to an embodiment of the present invention.

Referring to FIG. 5 , the main processor 150 may synchronize the reference frequency signal 310 and the PD pulse digital signal 330 based on the zero phase point 311 of the reference frequency signal 310.

The reason for synchronization is to detect a pattern in which partial discharge signals are periodically generated in the same phase.

Figure 2 will be described again.

The main processor 150 buffers the PD digital signal in units of one cycle of the synchronized PD pulse digital signal (S209).

In one embodiment, the main processor 150 may buffer a unit PD digital signal corresponding to one cycle of the PD pulse digital signal synchronized with the reference frequency signal.

In one embodiment, buffering a unit PD digital signal of one cycle may represent an operation of temporarily storing digital data of one cycle.

FIG. 6 is a diagram illustrating a process of buffering a unit PD digital signal of one period from a PD pulse digital signal according to an embodiment of the present invention.

Referring to FIG. 6, the main processor 150 may buffer the unit PD digital signal 600 for one period based on the zero phase point from the PD pulse digital signal 330 synchronized with the reference frequency signal.

Figure 2 will be described again.

The main processor 150 obtains a reference voltage for detection of valid data, taking noise into account, from the buffered unit PD digital signal of one cycle (S211).

In one embodiment, the reference voltage may be a voltage used to detect a PD peak point containing information about partial discharge from a unit PD digital signal of one cycle.

The reference voltage may be a preset voltage.

The main processor 150 uses the obtained reference voltage to extract a PD peak point from a plurality of PD points included in the unit PD digital signal (S213).

This will be explained with reference to FIGS. 7 and 8.

FIG. 7 is a diagram illustrating the reference voltage that serves as a reference for detecting the PD peak point according to an embodiment of the present invention, and FIG. 8 is a diagram illustrating the PD peak point using the reference voltage according to an embodiment of the present invention. This is a diagram explaining the detection process.

Referring to FIG. 7, the main processor 150 may set a reference voltage as a reference for detecting the PD peak point.

Afterwards, as shown in FIG. 8, the main processor 150 may extract the PD peak point 800 that exceeds the reference voltage from the PD digital data 600 of one cycle.

PD peak point 800 may include information about the peak voltage and the phase corresponding to the peak voltage.

Figure 2 will be described again.

The main processor 150 extracts valid data containing information about the detected PD peak points (S215).

In one embodiment, the main processor 150 may use the valid data as data extracted from the PD peak point and include the peak voltage and phase of the PD peak point.

Below, the processes of steps S205 to S215 will be comprehensively described.

Figure 9 is a diagram comprehensively explaining the process of extracting valid data according to an embodiment of the present invention.

Referring to FIG. 9 , the main processor 150 may detect the zero phase point 311 from the reference frequency signal 310. The zero phase point 311 may be a point corresponding to an inflection point that changes from a negative phase to a positive phase.

Additionally, the main processor 150 may extract a starting point for synchronization with the PD pulse digital signal based on the reference frequency signal 310.

The main processor 150 may convert the extracted starting point into publicly usable system clock information to synchronize with the PD pulse digital signal.

Afterwards, the main processor 150 extracts a unit PD digital signal corresponding to one cycle in accordance with the system clock 901 corresponding to the starting point repeated for each cycle.

The main processor 150 can sample 40000 PD points from PD digital data corresponding to one cycle. Here, 40,000 is just an example.

The main processor 150 may process each of the plurality of PD points as a signal and obtain the magnitude and phase of the voltage for each of the plurality of PD points from the processing results.

The main processor 150 extracts only PD points whose voltage exceeds the reference voltage among the plurality of PD points 910 as valid PD points 930, and stores data for the extracted effective PD points 930. You can.

PD pulse digital data secured at a 2.4MHz sampling rate must store data equivalent to 40,000 PD points based on one cycle of a reference frequency signal of 60Hz.

When processing PD pulse digital data of 100 cycles, excessive memory requirements may occur to the extent that additional external memory is needed to store it.

According to an embodiment of the present invention, in order to prevent this, the main processor 150 synchronizes the unit PD digital signal for one cycle each time, stores only data for valid PD points, and repeats this operation every cycle. You can.

Accordingly, when analyzing PD pulse digital data for 100 cycles, the required memory capacity is reduced to 1/100, making it possible to minimize memory capacity without the need for a large capacity external memory.

Meanwhile, valid data for the valid PD point 930 may be compressed and transmitted in the format shown in FIG. 10.

FIG. 10 is a diagram illustrating the structure of effective data containing information on effective PD points indicating the occurrence of partial discharge according to an embodiment of the present invention.

Referring to FIG. 10, valid data 1000 contains period information 1010, phase information 1030, and size information 1050.

Period information 1010 includes information indicating which period the relevant valid data is in.

Phase information 1030 includes information indicating the phase detected from the effective PD point 930.

The magnitude information 1050 includes information indicating the magnitude of the voltage detected from the effective PD point 930.

The main processor 150 may compress period information 1010, phase information 1030, and size information 105 to generate valid data 1000.

The main processor 150 can packetize the combination of valid data 1000 and transmit it to an external system through the wireless communication device 140.

Figure 2 will be described again.

The main processor 150 determines whether the standard number of PD pulse signal cycles required for the PRPD analysis technique has been secured (S217).

The reference number may be the number of times necessary to detect partial discharge by analyzing valid data through the PRPD technique.

In one embodiment, the standard number may be 100 cycles, but this is only an example.

When the standard number of PD pulse signal cycles required for the PRPD technique is secured, the main processor 150 transmits a valid data packet, which is a combination of valid data, to the outside (S219).

In one embodiment, the main processor 150 may transmit a valid data packet, which is a combination of valid data, to the PD analysis system through the wireless communication device 140.

For example, a valid data packet may be a combination of 100 valid data collected over 100 cycles.

This will be explained with reference to FIG. 11 .

Figure 11 is a diagram explaining a combination of valid data packets according to an embodiment of the present invention.

Referring to FIG. 11, a valid data packet 1100 may include a plurality of valid data 1100-1 to 1100-n.

Each valid data may include period information, phase information of the PD peak point sampled in the corresponding period, and size information of the PD peak point sampled in the corresponding period.

The main processor 150 may transmit the valid data packet 1100 to the PD analysis system through the wireless communication device 140.

In this way, if PD sensing data is compressed into an array of valid data, data can be transmitted through a low-power sensor network in a way that uses existing high-speed wired transmission.

Again, Fig. 2 will be described.

Afterwards, the main processor 150 deactivates the PD detection sensor 131 (S221).

Figure 12 is a diagram explaining the configuration of a partial discharge detection sensor according to an embodiment of the present invention.

The partial discharge detection sensor 1200 according to FIG. 12 may be replaced with the partial discharge detection sensor 131 shown in FIG. 1.

Referring to FIG. 12, the partial discharge detection sensor 1200 according to an embodiment of the present invention includes a magnetic sensor 1201, an amplifier 1203, a high-pass filter 1205, a low-pass filter 1207, and a log amplifier ( 1209).

The magnetic sensor 1201 can sense a partial discharge pulse signal and a phase current signal.

The magnetic sensor 1201 may be configured in a full bridge or half bridge form.

The amplifier 1203 may amplify the partial discharge pulse signal and the phase current signal output from the magnetic sensor 1201.

Amplifier 1203 may be a differential amplifier.

The high-pass filter 1205 may remove noise signals from the partial discharge pulse signal.

The low-pass filter 1207 may be a filter for passing a reference frequency signal.

The log amplifier 1209 may use the partial discharge pulse signal passed from the high-pass filter 1205 to determine whether partial discharge has occurred and the degree of occurrence of the partial discharge.

FIG. 13A is a circuit diagram showing the configuration of a general magnetic sensor, and FIG. 13B is a circuit diagram showing the configuration of a magnetic sensor according to an embodiment of the present invention.

Referring to FIG. 13A, the existing magnetic sensor 1310 outputs an electromagnetic signal with a phase difference of 180 degrees according to the size of the magnetic field through the Vp terminal and the Vn terminal.

However, the existing magnetic sensor 1310 has poor response to incoming high-frequency electromagnetic signals and poor Vp or Vn output characteristics.

Referring to FIG. 13b, the magnetic sensor 1330 according to an embodiment of the present invention transmits a high-frequency partial discharge signal without loss in Vn or the difference between Vp and Vn, without affecting the magnetic field generated by the magnetic sensor 1330. It may include two capacitors (C1, C2) for output.

The first capacitor C1 may be connected to the Vp terminal, and the second capacitor C2 may be connected to the Vn terminal.

Additionally, the magnetic sensor 1330 may include a capacitor C3 and an inductor L1 so that high-frequency partial discharge signals can flow in without loss while preventing mutual interference with the direct current power source Vs.

Additionally, a pad with a large area may be attached to the inlet terminal of the partial discharge signal to increase the reception sensitivity of the partial discharge signal.

Figure 14 is a diagram comparing the output of the signal observed at Vp-Vn when a reference frequency signal of 60Hz is applied to each of the existing magnetic sensor and the magnetic sensor according to an embodiment of the present invention.

The reference frequency signal of 60Hz may be an alternating current signal with a frequency of 60Hz.

Referring to FIG. 14, when a reference frequency signal of 60 Hz is applied to each of the existing magnetic sensor 1310 and the magnetic sensor 1330 according to an embodiment of the present invention, the signal observed at Vp-Vn has the same waveform (1400). can have (i.e. are nested).

That is, the magnetic sensor 1330 according to an embodiment of the present invention has the same performance in output of the reference frequency signal.

Figure 15 is a diagram comparing the output of differential signals (Vp-Vn) according to the frequency of a high-frequency signal applied to a conventional magnetic sensor and a magnetic sensor according to an embodiment of the present invention.

Referring to FIG. 15, the first differential output signal 1510 according to the frequency of the high-frequency signal applied to the terminal 1311 of the existing magnetic sensor 1310 and the PD of the magnetic sensor 1330 according to an embodiment of the present invention. A second differential output signal 1530 according to the frequency of the high frequency signal applied to the input terminal 1331 is shown.

The high frequency signal applied to each terminal may be a partial discharge signal.

Compared to the first differential output signal 1510, the second differential output signal 1530 has good response characteristics to high-frequency signals of 1 MHz or higher.

Additionally, the cut-off frequency can be adjusted by the resistance of the magnetic sensor 1330 and the sizes of the additionally installed capacitors C1 and C2. The cut-off frequency may be a frequency corresponding to a voltage that is 70% of the maximum output voltage. In Figure 15, the cut-off frequency may be 1 MHz.

Figures 16a and 16b are diagrams showing output results of a high-frequency partial discharge signal and a 60Hz reference frequency signal when using an existing magnetic sensor.

Figure 16a shows the frequency response characteristic waveform 1600 output from the Vp and Vn terminals of the existing magnetic sensor 1310. Since the frequency response characteristic waveforms 1600 output from the Vp terminal and the Vn terminal have the same waveform, they are expressed as overlapping.

Referring to FIG. 16b, the first waveform 1610 output from the Vp terminal of the existing magnetic sensor 1310, the second waveform 1620 output from the Vn terminal, and the third waveform 1630 output from the differential terminal are It is shown.

Referring to FIG. 16B, it can be seen that the first waveform 1610 contains the first partial discharge signal 1611, and the second waveform 1620 contains the second partial discharge signal 1621.

Looking at the third waveform 1630 output from the differential terminal, the high-frequency partial discharge signal is completely canceled by the differential signal and is not output.

Figures 17a and 17b are diagrams showing output results of a high-frequency partial discharge signal and a 60Hz reference frequency signal when using a magnetic sensor according to an embodiment of the present invention.

Figure 17a shows the frequency response characteristic waveform 1701 output from the Vp terminal and the frequency response characteristic waveform 1703 output from the Vn terminal of the magnetic sensor 1330 according to an embodiment of the present invention.

Referring to Figure 17b, the first waveform 1710 output from the Vp terminal, the second waveform 1720 output from the Vn terminal, and the third waveform output from the differential terminal of the magnetic sensor 1330 according to an embodiment of the present invention. Waveform 1730 is shown.

It can be confirmed that the first waveform 1710 does not contain a partial discharge signal, and only the second waveform 1720 contains a partial discharge signal.

Looking at the third waveform 1730 output from the differential terminal, it can be confirmed that the partial discharge signal 1731 is included.

That is, when using the magnetic sensor 1330 according to an embodiment of the present invention, a high-frequency partial discharge signal can be detected at the differential terminal, unlike the existing magnetic sensor 1310.

Figure 18a is a diagram comparing waveforms obtained when using a high frequency current transformer (HFCT) sensor, which is generally applied to void partial discharge waveforms, and when using a magnetic sensor according to an embodiment of the present invention.

Referring to Figure 18a, it can be seen that the partial discharge waveform obtained using the void discharge sample has the same pattern as when using the magnetic sensor of the present invention or when using the HFCT sensor.

Figure 18b is a diagram comparing waveforms obtained when using a high-frequency current transformer sensor generally applied to detect corona partial discharge waveforms and when using a magnetic sensor according to an embodiment of the present invention.

Referring to Figure 18b, it can be seen that the partial discharge waveform obtained using the corona discharge sample has the same pattern as when using the magnetic sensor of the present invention or when using the HFCT sensor.

The present invention described above can be implemented as computer-readable code on a program-recorded medium. Computer-readable media includes all types of recording devices that store data that can be read by a computer system. Examples of computer-readable media include HDD (Hard Disk Drive), SSD (Solid State Disk), SDD (Silicon Disk Drive), ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, etc. There is.

Accordingly, the above detailed description should not be construed as limiting in any respect, but should be considered illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

Claims (10)

In the partial discharge detection system,
A partial discharge detection device that generates a reference frequency signal, detects a partial discharge pulse signal, and converts the detected partial discharge pulse signal into a partial discharge digital signal;
a main processor that synchronizes the partial discharge digital signal based on the zero phase point of the reference frequency signal, extracts valid data from the synchronized partial discharge digital signal, and stores the extracted valid data; and
Comprising an energy harvesting power supply that supplies power to the partial discharge detection device and the main processor,
The main processor is
Buffering a unit partial discharge digital signal of one cycle from the synchronized partial discharge digital signal,
Extract the partial discharge peak point exceeding the reference voltage from the buffered unit partial discharge digital signal,
Extracting the effective data from the extracted partial discharge peak point
Partial discharge detection system. delete According to paragraph 1,
The above valid data is
Containing period information, voltage magnitude information, and phase information corresponding to the partial discharge peak point.
Partial discharge detection system. According to paragraph 3,
The main processor is
Determining whether a reference number of partial discharge pulse signal periods has been secured, and if secured, generating a valid data packet that is a combination of the valid data
Partial discharge detection system. According to paragraph 4,
The valid data packet is
Containing an array of valid data for each of a plurality of partial discharge peak points
Partial discharge detection system. According to clause 5,
The partial discharge detection system is
Further comprising a wireless communication device for transmitting the valid data packet to the partial discharge analysis system.
Partial discharge detection system. According to clause 6,
The wireless communication device transmits the valid data packet to the partial discharge analysis system using a low-power long-distance network standard.
Partial discharge detection system. According to paragraph 1,
The partial discharge detection device is
a reference signal generator generating the reference frequency signal;
a partial discharge detection sensor that detects the partial discharge pulse signal; and
Comprising an analog signal processor that converts the partial discharge pulse signal into the partial discharge digital signal.
Partial discharge detection system. According to clause 8,
The partial discharge detection sensor is
containing a magnetic sensor
Partial discharge detection system. According to paragraph 1,
The energy harvesting power supply device is
Solar cells that absorb solar energy;
a power conversion unit that converts the solar energy into electrical energy; and
Comprising a secondary battery that stores the converted electrical energy
Partial discharge detection system.

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